Find the value of Sin²(57.37°)+ Sin²(32.63°) + cot²(65.43°). sec² (65.43°) – tan²(24.57°)
(a) 0
(b) 1
(c) -1
(d) 2
Sol:
sin²A + Sin²B = 1 [ when A + B = 90°]
1+cosec ²(65.43°) – cot²(65.43°)
=1+1
=2
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